Cellular uptake of S413-PV peptide occurs upon conformational changes induced by peptide-membrane interactions

Biochimica Et Biophysica Acta
Miguel ManoMaria C Pedroso de Lima

Abstract

In face of accumulated reports demonstrating that uptake of some cell-penetrating peptides occurs through previously described endocytic pathways, or is a consequence of cell fixation artifacts, we conducted a systematic analysis on the mechanism responsible for the cellular uptake of the S4(13)-PV karyophilic cell-penetrating peptide. The results reviewed here show that the S4(13)-PV peptide is able to very efficiently accumulate inside live cells in a rapid, non-toxic and dose-dependent manner, through a mechanism distinct from endocytosis. Comparative analysis of peptide uptake by mutant cells lacking heparan sulfate proteoglycans demonstrates that, although not mandatory, their presence at cell surface facilitates the cellular uptake of the S4(13)-PV peptide. Furthermore, we demonstrate that upon interaction with lipid vesicles, the S4(13)-PV peptide undergoes significant conformational changes that are consistent with the formation of helical structures. Such conformational changes occur concomitantly with a penetration of the peptide into the lipid bilayer, strongly suggesting that the resulting helical structures are crucial for the non-endocytic cellular uptake of the S4(13)-PV peptide. Overall, our data support that, r...Continue Reading

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Citations

Mar 28, 2009·International Journal of Molecular Sciences·Sandra VeldhoenTobias Restle
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